Press Esc to enter the shell. After that you should see output similar to the following:

Please take note of which filesystem number (fs*) your USB drive is mapped to. In this example, it's fs1.

Switch to that filesystem by entering it with a leading colon. In this case:

fs1:

Navigate to the path where you decompressed the update (the cd and ls commands are available here, as if in an Unix shell).

Run the following command:

UP Board: go_64.nsh

UP Squared: GO.nsh

Warning:

the bios update procedure will take some time to complete: don't interrupt the procedure until the board reboot itself in the operating system

If the utility does not automatically reboot your device, you can restart your board with:

reset

Note: if after pressing F7 the BIOS ask for a password, simply press Enter to go to the next screen.

Note: if on the first BIOS Menu or in the UEFI shell your usb drive is not shown probably the usb is corrupted. Please try it again with a new usb drive.

Engineering BIOS password

To avoid accidentally bricking the board by changing certain advanced BIOS parameters ("CRB" settings), these have been hidden behind an admin password.

Warning:

by changing settings in CRB BIOS menus, users risk bricking the board, and will not be able to claim the warranty in this case.

If you agree to the above, click Expand to see the password:

upassw0rd

BIOS chip hardware flashing for UP board

If the board is unusable and the regular update procedure can't be applied, the board may be recoverable by directly flashing the BIOS chip with a SPI EEPROM programmer. See BIOS chip flashing for instruction.

BIOS chip hardware flashing for UP Squared

If the board is unusable and the regular update procedure can't be applied, the board may be recoverable by directly flashing the BIOS chip with a SPI EEPROM programmer. See BIOS chip flashing on UP Squared for instruction.

Open Source UEFI bios

Intel made available the Open Source UEFI BIOS with support for UP2.
You can find more information and all the necessary instructions from this link: Source Firmware UP2

Coreboot added support for UP Squared, more information can be found from this link: on UP Squared